DS3105 Maxim Integrated Products, DS3105 Datasheet - Page 12

• Manufacturer Part Number: DS3105
• Description: Line Card Timing IC
• Manufacturer: Maxim Integrated Products

Table 6-3. Global Pin Descriptions
Pin Name
RST
SRCSW
TEST
O3F1 /
SRFAIL
O3F2 / LOCK
O6F0 / GPIO1
O6F1 / GPIO2
O6F2 / GPIO3
SONSDH /
GPIO4
INTREQ /
LOS
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(1)
Type
IO
IO
IO
IO
IO
IO
I
I
I
O
PU
PD
PD
PU
PD
PD
PD
PU
PD
3
(2)
OC3 Frequency Select 1 / SRFAIL Status Pin .
This pin is sampled when the RST pin goes high and the value is used as O3F1 which together
with O3F2 and O3F0 sets the default frequency of the OC3 output clock pin. See
After RST goes high, if MCR10:SRFPIN = 1, this pin follows the state of the SRFAIL status bit in
the
reference. When MCR10:SRFPIN = 0, SRFAIL is disabled (low).
Pin Description
Reset (active low).
When this global asynchronous reset is pulled low, all internal circuitry is reset to default values.
The device is held in reset as long as RST is low. RST should be held low for at least two
REFCLK cycles after the external oscillator has stabilized and is providing valid clock signals.
Source Switching
Fast source-switching control input. See section 7.6.5. The value of this pin is latched into
MCR10
between IC3/IC5 and IC4/IC6, if enabled.
Factory Test Mode Select.
Wire this pin to VSS for normal operation.
OC3 Frequency Select 2 / T0 DPLL LOCK Status /.
This pin is sampled when the RST pin goes high and the value is used as O3F2 which together
with O3F1 and O3F0 sets the default frequency of the OC3 output clock pin. See
After RST goes high, if MCR1.LOCKPIN=1, this pin indicates the lock state of the T0 DPLL.
When MCR1.LOCKPIN=0, LOCK is disabled (low).
OC6 Frequency Select 0 / General Purpose I/O Pin 1.
This pin is sampled when the RST pin goes high and the value is used as O6F0 which together
with O6F2 and O6F1 sets the default frequency of the OC6 output clock pin. See
After RST goes high this pin can be used as a general purpose I/O pin. GPCR:GPIO1D
configures this pin as an input or an output. GPCR:GPIO1O specifies the output value.
GPSR:GPIO1 indicates the state of the pin.
OC6 Frequency Select 1 / General Purpose I/O Pin 2.
This pin is sampled when the RST pin goes high and the value is used as O6F1 which together
with O6F2 and O6F0 sets the default frequency of the OC6 output clock pin. See
After RST goes high this pin can be used as a general purpose I/O pin. GPCR:GPIO2D
configures this pin as an input or an output. GPCR:GPIO2O specifies the output value.
GPSR:GPIO2 indicates the state of the pin.
OC6 Frequency Select 2 / General Purpose I/O Pin 3.
This pin is sampled when the RST pin goes high and the value is used as O6F2 which together
with O6F1 and O6F0 sets the default frequency of the OC6 output clock pin. See
After RST goes high this pin can be used as a general purpose I/O pin. GPCR:GPIO3D
configures this pin as an input or an output. GPCR:GPIO3O specifies the output value.
GPSR:GPIO3 indicates the state of the pin.
SONET/SDH Frequency Select Input or GPIO4 Pin.
When RST goes high the state of this pin sets the reset-default state of MCR3:SONSDH,
MCR6:DIG1SS and MCR6:DIG2SS. After RST goes high this pin can be used as a general
purpose I/O pin. GPCR:GPIO4D configures this pin as an input or an output. GPCR:GPIO4O
specifies the output value. GPSR:GPIO4 indicates the state of the pin.
Reset latched values:
Interrupt Request / Loss of Signal.
Programmable (default: INTREQ). The INTCR:LOS bit determines whether the pin is indicates
interrupt requests or loss of signal (i.e. loss of selected reference).
INTCR:LOS=0: INTREQ mode
INTCR:LOS=1: LOS mode
MSR2
0 = Not Locked
1 = Locked
0 = SDH rates (N x 2.048 MHz)
1 = SONET rates (N x 1.544 MHz)
The behavior of this pin is configured in the
active-low. Drive action can be push-pull or open-drain. The pin can also be configured as
a general-purpose output if the interrupt request function is not needed.
This pin indicates the real-time state of the selected reference activity monitor (see section
7.5.3). This function is most useful when external switching mode (section 7.6.5) is enabled
(MCR10:EXTSW=1).
:EXTSW when RST goes high. After RST goes high this pin can be used to select
register. This gives the system a very fast indication of the failure of the current
Preliminary. Subject to Change Without Notice.
12 of 110
INTCR
register. Polarity can be active-high or
Table
Table
Table
Table
Table
7-18.
7-18.
7-17.
7-17.
7-17.
DS3105